rearrange unit-testing basics and ember-qunit

previous order introduced ember-qunit, then didn't use it in the next
section on basic testing. put Ember.Object unit testing basics first,
then introduce ember-qunit.
add redirect for previous testing/unit page
rearrange unit-testing basics and ember-qunit

previous order introduced ember-qunit, then didn't use it in the next
section on basic testing. put Ember.Object unit testing basics first,
then introduce ember-qunit.
add redirect for previous testing/unit page
Merge branch 'clarify-ember-testing-order' of github.com:knomedia/website into clarify-ember-testing-order
Merge pull request #1449 from knomedia/clarify-ember-testing-order

rearrange unit-testing basics and ember-qunit